WoW Freakz link:
Bug description: The Legionfall United class order hall advancement ability does not work as intended. Currently, it is adding arbitrary amounts of artifact power, ranging anywhere from a few hundred at Artifact Knowledge 40, to 10%. As the tooltip suggests, there should be a chance to grant double artifact power, not random amounts or percentages of artifact power.
Proof: https://imgur.com/a/fEbLYQQ